The chemical symbol for osmium is Os. Osmium is a dense, bluish-white metal that belongs to the platinum group and is known for its hardness and durability. With an atomic number of 76, it is one of the densest naturally occurring elements. Osmium is used in various applications, including fountain pen tips, electrical contacts, and some high-performance alloys. Its compounds are also studied for their potential in catalysis and other chemical processes. Due to its rarity and unique properties, osmium is considered valuable in both industrial and scientific contexts.